Polyglot Dictionary
🇪🇸 Spanish

Why Is problema Masculine? Spanish's Gender Exceptions

¿Por qué problema es masculino? Las excepciones de género en español

October 9, 2026

Double-click any coloured word to save it to My Words and test yourself later.

Open almost any Spanish grammar book and you'll find the same rule on page one: nouns ending in -a are feminine (la casa, la mesa), and nouns ending in -o are masculine (el libro, el gato). It's a genuinely useful rule — most of the time. But a surprising number of everyday words break it, and they're common enough that you'll run into them in your very first weeks of learning Spanish. The most famous is el problema: it ends in -a, it looks exactly like la casa, and yet it's masculine.

We went through every noun in this dictionary's Spanish–English pair and compared its real gender against the gender its spelling would predict. We found 191 mismatches. Most of them fall into four clear patterns — and once you know the patterns, the exceptions stop feeling random.

1. Greek-root words in -ma and -ta: genuinely masculine

A large group of Spanish words ending in -ma came from Greek nouns that were already a different gender, and Spanish kept that gender instead of switching them to match the Spanish -a pattern. This is the single biggest source of exceptions, and it includes some of the most common words in the language: el problema, el día, el mapa, el programa, el sistema, el idioma, el planeta, el tema, el clima, el drama, and el poema.

Notice how early-level most of these are — el día, el mapa and el problema are all words an A1 beginner learns in the first few lessons. That's exactly why this pattern is worth memorizing early, rather than hoping it will "feel right" later: these words show up constantly, and the ending genuinely won't help you guess.

2. Shortened and inherited words: feminine despite -o or -or

The mismatch runs the other way too. A handful of very common words end in -o — normally a strong signal for masculine — but are actually feminine, because they're short for a longer feminine word. La foto is short for la fotografía; la moto is short for la motocicleta; la radio is short for la radiodifusión (though in parts of Latin America el radio is used for the physical device — a case where the gender genuinely varies by region).

La mano (hand) isn't shortened from anything — it's simply an irregular holdover from Latin, where the word for "hand" happened to be feminine despite looking like a masculine-pattern noun, and Spanish never changed it. A smaller set of words ending in -or — usually masculine, as in el color, el amor, el dolor — are feminine for the same reason: la flor, la labor, and la coliflor (literally "cabbage-flower," inheriting flor's gender).

3. The el agua trick: still feminine, just easier to say

This is the pattern most learners get wrong in the opposite direction — assuming a word has switched gender when it hasn't. Spanish avoids putting la directly in front of a feminine word that starts with a stressed a- sound, because la agua is awkward to say out loud. So the article switches to el in the singular only: el agua, el águila (eagle), el alma (soul), el arca (ark), el arpa (harp), el aula (classroom), el hada (fairy), el habla (speech).

These words are still grammatically feminine in every other way — el agua fría (not frío), el águila majestuosa (not majestuoso) — and the plural reverts to las: las aguas, las águilas. Watch out for el asma (asthma) in particular — it looks like it belongs with el problema and el sistema in group 1 above, since it also ends in -ma, but it's actually this euphony rule in disguise: asma is feminine, not a Greek-root masculine.

4. Not real exceptions: words that work for both genders

A last group looks like a huge pile of exceptions but isn't, really. Spanish has many person-describing nouns ending in -ista (and a few in -a) that don't change form for men and women at all — only the article changes: el periodista / la periodista, el turista / la turista, el artista / la artista, el pianista / la pianista, el futbolista / la futbolista, el guía / la guía. Our dictionary lists one representative gender per entry, but both are correct — the gender simply follows the person being described, same as el/la estudiante.

Once you've seen these four patterns, 191 "random exceptions" turns into four short lists worth memorizing — and the ones that matter most (problema, día, mapa, mano, foto) are words you'll use every single day. Every entry page in our Spanish dictionary already shows this visually: the background colour is the word's real gender, and the underline is the gender its ending would have predicted — so a mismatch like problema is something you can literally see at a glance.